And downstream of those areas there are tektites being found, but only one or two per county.

Samples of sediment taken from the seafloor southeast of the crater, but not those obtained elsewhere around the crater, contain small mineral globules called tektites, one hallmark of an extraterrestrial impact.

These bits of glass, called tektites, appear to be scattered across the entire region that the researchers examined, suggesting that much of the Pampean Plain is a vast tektite field.